linux-kernel - Re: [PATCH][RESEND] do not redefine userspace's NULL #define

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Date:	Sat, 14 Apr 2012 01:27:58 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Lubos Lunak <l.lunak@...e.cz>
Cc:	Peter Seebach <peter.seebach@...driver.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH][RESEND] do not redefine userspace's NULL #define

On Sat, Apr 14, 2012 at 1:21 AM, Lubos Lunak <l.lunak@...e.cz> wrote:
>
>  How about the patch? Are there any *actual* problems with it or can it please
> go in?

If we're going to change that thing, I'd actually prefer to just move
it inside the #ifdef __KERNEL__ entirely, and get rid of the cplusplus
case.

IOW, something like this (obviously white-space-mangled) patch:

    diff --git a/include/linux/stddef.h b/include/linux/stddef.h
    index 6a40c76bdcf1..1747b6787b9e 100644
    --- a/include/linux/stddef.h
    +++ b/include/linux/stddef.h
    @@ -3,14 +3,10 @@

     #include <linux/compiler.h>

    +#ifdef __KERNEL__
    +
     #undef NULL
    -#if defined(__cplusplus)
    -#define NULL 0
    -#else
     #define NULL ((void *)0)
    -#endif
    -
    -#ifdef __KERNEL__

     enum {
     	false	= 0,

which protects the kernel NULL definition along with the whole
offsetof and true/false ones too. And just gets rid of the insane C++
case entirely.

                Linus
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